[Doc] Move examples into categories (#11840)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

examples/online_serving/openai_embedding_client.py

@@ -0,0 +1,25 @@
+from openai import OpenAI
+
+# Modify OpenAI's API key and API base to use vLLM's API server.
+openai_api_key = "EMPTY"
+openai_api_base = "http://localhost:8000/v1"
+
+client = OpenAI(
+    # defaults to os.environ.get("OPENAI_API_KEY")
+    api_key=openai_api_key,
+    base_url=openai_api_base,
+)
+
+models = client.models.list()
+model = models.data[0].id
+
+responses = client.embeddings.create(
+    input=[
+        "Hello my name is",
+        "The best thing about vLLM is that it supports many different models"
+    ],
+    model=model,
+)
+
+for data in responses.data:
+    print(data.embedding)  # list of float of len 4096